Urban Accessibility Mapping Party
Via Co-Creative Recipes:
"A mapping party aiming to document areas that can be accessed by disabled people.
This is usually done on Open street Map, but there are also some proprietary mobile apps that are sometimes used.
This is a kind of counter mapping whereby a social problem is made visible in order to induce a change." (http://www.co-creative-recipes.cc/recipes/urban-accessibility-mapping-party/)